Combined type-writing and computing machine.



W. WRIGHT. COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED, FEB. 26,19I2.

Patented Apr. 2, 1918.

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i w. wmGHT. COMBINED TYPE WRITING AND COMPUTING MACHINE APPLICATIONFILED FEB. 26. |912.

Patented Api.2,1918g www EEEEEEEEEF WITNESS ES:

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W. WRIGHT. COMBINED TYPE WRITING AND COMPUTING MACHINE. APPLICATIONFILED FEB. 26, 1912.

1,261,335. Patented Ap1-.2,1918.

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W. WRIGHT. COMBINED TYPE WRITING AND COMPUTING MACHINE. APPLICATIONFILED FEB. 26, 1912.

l ,26 1,335. Patented Apr. 2, 1918.

4 sIIEETs-sHEE'T 4.

FIGJZ 428 f' 4a f' INVENToR: INEsss; WWW/@ f 1 W ATTORNE;

ycitizen ot the United States, residing waarna onerosi ASSGNR TOUNDERNOOD COMPUTENG ,335 Speciicatior. or" Letters Patent.

Patented Apr. 2, 1918.

Application iik-:d February 19M?. serial 1i' o. 679,851.

To all whom t may concern.'

lie it known that l, W'Arirnn lifarorrnn in New York city, in the countyof New ork and State of' N ew York, have invented certain new and usefulllmprovementsin Combined Type-Writing and Computing Machines, of whichthe following is a specification. v f

-This invention relates to the connections between the keys and thecomputing wheels or memhers, and is of especial value in combinedtypewriting and computingl machines;

ln a. cri-pend'ng case No. 677,046, tiled February 12, 1912, there isdisclosed a combined typewriting and computing machine of the key-driventype in which a master wheel operates serz'catz'm upon the computinglwheels and rotates each, an amount varying according' to the key struck.The master wheel is normally held locked by a universal lock, which, onthe depression of any numeral key, is released; and at the same time anindividual lock operated by that key is thrown in to lock or cont-olsaid master wheel. As the'key descends, a driver operated by the keyrotates a gear wheel on which are teeth proportionate in number to thedigit which'the type operated by the key will print, and these teethrotate said master wheel. At the moment said master wheel is rotated bythe last et said gear teeth, it is again locked by `an individual lock.r1`he key may then descend idly so rar as the computing' mechanism isconcerned in the said application. @n the return stroke or" the key, theuniversal lock holds said master wheel locked; and at the very end ofthe return stroke, an arm on the driver moving' with the key turns saidgear wheel, so that said driver will positively mesh with said lgearwheel en the next down stroke of the key. rlhe masternwheel is alwayslocked or in mesh with the gear wheel operated by the type key, unlessthe ,gear wheel is in its vidle position', and in "that idle position auniversal lock. holdssaid master wheel shaft locked. Therefore, themast-er wheel and any wheel in mesh with it are always either positivelydriven or apositively locked.

rThe key operated driving segment in the present disclosure is formedwith a flat surtace which will ope `ate like a Geneva movement inconnection with the gear wheel meshing with the segment. This gear wheelis thus arranged to be positively locked in its normal position, and isalso locked at the end of the down stroke of the segment.

Said gear is moreover locked during` the return or 11p-stroke of the keyby another surface on said segment. The surface which forms the lock tohold said gear in its normal idle position, is designed, at the end of'the rip-stroke of said segment, to strike a tooth on said gear, andthereby O'ive the gear a slight turn. This turn is suiiiacient to makethe first tooth on said gear intercept the lirst tooth of the segment onits next depression, and thus meshing of the teeth onsegment and gearwheel is made positive.y

rihis turn is preferably given without the use of any spring, and sincethere is practically no weight added to the wheels r segment, the touchor the keys is exceed- A ine'ly light.

@ther 'features and advantages will hereinafter appear.

lin accompanying drawings.

Figure 1 is a diagrammatic side view o' an Underwood typewriting machinashowing' my invention as applied thereto.

Fig. 2 is a similar front view of the same.

Figs. 3, 4t and 5 illustrate a driver and associated parts in successivepositions when the driver is being depressed by the operation of anumeral key.

Fig. 6 is a front view of the connections between a driver and themaster wheel shaft.

Fig'. 7 is a perspective view of a locking and driving wheel operated bya driver.

Fig. S is a perspective View of part ot a driver.

Figs. 9 to 17 are views of the driving gears operated by the segment,showing them 1for the diiierent numeral keys from ((177 to 66957.

ln the drawings, numeral keys 1 and character keys 2 depress levers 3 tooperate helleranks 4' to swing type bars 5 upwardly and rearwardly,causing type 6 to strike against the platen 7 on the carriage 8. Thecarriage is drawn forward by a spring- 9, and is controlled in itsmovement by a rack 10, meshing with a pinion 11 on the hub of anesoapement wheel 12. This escapement wheel is controlled by dogs 13operated by a universal bar 14 which is struck by heels 15 on the typebars 5, as the type approach the platen.

A totalizer 16 is supported by arms 17 riding in slots 18 on the frontof the machine, and travels along with the carriage from which it isdriven by an arm 19 resting in a yoke 20 on, said totalizer. In saidtotalizernumber wheels 21 are driven by a master wheel 22 on a shaft 23extending transversely of the typewriter. This shaft turns the dialsthrough intermediate gears 24 and is turned by the numeral keys in amanner presently to be described, through a gear 22a.

On each numeral key 1, there is fast an adjustable link 28 dependingfrom a sevment or driver 29 which is loose on. shaft 29a extendingacross the upper part of the frame of the machine. On the arcuatesurface of this segment are cut teeth 30 over part of its length. Theseteeth are arranged to mesh with teeth 31 on a mutilated gear wheel 32,and drive it; said gear wheel is loose on shaft 32a. At the upper end ofthe toothed section of said segment is a raised arcuate surface 34 equalin height to the teeth. Most of the teeth in this segment extend onlypart way -across the surface, as seen in Fig. 8; and the part 37 of thesegment across which they do not extend is of the same height as saidarcuate surface 34 at the end of the segment. The hollows or groovesbetween the two teeth at opposite ends, however, extend entirely acrossthe segment.

The gear wheel 32, whose teeth mesh with this segment, has in thepresent case, eight of its teeth extending only part way across thesection of the wheel which meshes with the segment, and the tworemaining teeth 33 and 38 which form the boundaries of the arc fromwhich the teeth are removed, extend entirely across.

The construction of the segment is best seen in Fig. S and of the gearwheel in Fig. 7. From the above description it will be seen that, when asegment is depressed by the operation of its numeral key, its teeth 3Qrotate the gear wheel until the broad tooth 33 sinks into and rises outof the broad groove 35 in the segment. Any further depression of thenumeral key locks the gear wheel, because the broad tooth 33 rides upon'the raised fiat surface 34 of the segrevint and slides on saidsurface.

lVhen the numeral key is released so that it returns upward, the broadtooth 33 slides over surface 34, until it reaches groove 35, where,owing to the fact that it lies entirely outside the point circle of theteeth 30, it will not be engaged or rotated by these teeth, but willride over on to the broad flat surface 37 of the segment beside theteeth 30, until the broad tooth 38 of the gear wheel reaches thedepression or groove 39 of the segment.

Beyond this depression 39 is a fiat portion 40 on the segment somewhatsimilar to the portion 34 of the upper end, but lower in height; thuspermitting the mutilated gear wheel to be rotated to bring its tooth 38down, so that on its return stroke it will mesh with the first of theteeth 30 on the segment.

To insure this meshing, the lower end of the driver' has its broadsurface raised at 4l, with an inclined cam surface extending thereto, sothat when the numeral key rises, said cam surface will force the broadtooth 33 on the gear wheel 32 to the position shown in Fig. 3. Thisturns said gear wheel so that the broad tooth 38 on said gear wheel willextend across the point circle of the teeth 30 and hence will bepositively engaged by the first tooth 30 on the segment beyond thedepression 39, on the next operation of said key. It will thus be seenthat for each complete reciprocation of a driver 29, the associatedmutilated gear 32 will be given one complete revolution.

Fast o-n the gear wheel 32 is a second mutilated gear having teeth 43proportionate to the numeral key operating it. In Figs. 3 to 8 and inFig. 17, this gear wheel illustrated is the one employed for the numeralkey 9 and consequently has nine teeth. These teeth 43 are arranged tostrike the teeth 44 of which there are ten, on the main shaft 27, whichdrives the master wheel through gear wheel 22a. Thus a completerevolution of the gear wheel 32, shown in these figures aforesaid, willturn said main shaft nine-tenths of one revolution.

Between the teeth 31 and the teeth 43, as best shown in Fig. 7, is a cam45 which is arranged to coperate with the curved surfaces on a wheel 47fast on main shaft 27. This cam is interrupted at 46.

It will be observed in Fig. 3 which represents the parts just at thebeginning of the stroke of the numeral key, that said interrupted orbroken away portion 46 of cam 45 is opposite one of the curved surfaceson wheel 47 fast on the main shaft, and thus so far as this cam isconcerned, the main shaft is permitted to revolve freely in thatposition. The instant, however, the parts move from the Fig. 3 to theFig. 4 position as occurs when a numeral key begins to move downward,the raised portion 4S of the cam 45 swings in front of the curvedsurface 47 (see Figs. 6 and 2) and locks the main shaft against driving.lVhen, however, a tooth 43 moves up to contact with tooth 44 on the mainshaft, the cam 45 is seen to be again cut away, so as to permit the mainshaft to turn as it is driven by said teeth 43, and after it is turnedagain by said teeth it is again locked by the portion 48 of said cam 45;thus locking main shaft again until the cut away portion 46 arrivesopposite said shaft. Thus it will be seen that unless the numeral keysare in their idle positions, the main shaft is either positively turnedor positively locked by the moving numeral key. l

A universal lock 49 is provided at one end of the main shaftdrivemechanism to cooperate with a second curved-surfaced Wheel 50 on awheel fast on said shaft 27; thus locking it. On this -universal lock 49is formed a pin 51 which rides in a cam slot 52 on an arm 53 fast on arock shaft 54. On this rock shaft are also fastened cam fingers 55, onefor each segment, and these cam fingers are operated by cam surfaces 56fast on gear wheel 32, and are also arranged with reference to gearteeth 43, (which, it will be remembered, are also fast on said gearwheel) so that the universal lock 49 is swung out free from the surfaces50 during the time that the teeth 43 are in mesh with the teeth 44 onthe main shaft and are driving it. Said finger is drawn back by spring42 Y against the cut away portion 57 of said cam surface after the lasttooth 43 has meshed with and passed the teeth 44 on the main shaft; thuslocking the parts. 4

Thus it will be seen that t-he universal lock holds the main shaftalways locked when it is in idle position, that is to say, the universallock always holds the main shaft locked unless the main shaft isotherwise looked or is being positively turned.

All the parts between the gear wheel 32 and the cam 56, as seen in Fig.7, form a unit which turns as a sleeve loose on shaft 32, and there isone such unit for each numeral key. Except for the varying number ofteeth 43' and the cam 45 which varies in Y the length of its part 48,these units may be 40q identical forl allthe numeral keys. Figs. 9 to 17show the arrangement of the varying lengthsof the raised portion 48 andthe I teeth 43 for each of the numeral keys from llto 9; the gear forkey 17 having one tooth, yfor key 2 having two teeth. The unitscomprising the 'gear wheels 32 may be spaced from each other on shaft32'L by collars 64. 'v

The operation may be summed up as follows:

The numeral ,keystruck depresses a segment 29, the surface 40 of whichholds the gearteeth 31 locked until the depression 39 is reached, ivhenthe teeth 3() mesh with the teeth 31 and rotate the gear wheel 32carrying the teeth 31. This gear wheel 32 moves with it its cam 45 tolock the main shaft, and its cam 56 in the meantime, is moving theuniversal locking member 49 out of operative position. As the gear wheel32 continues to turn, the teeth 43 moving with it, mesh with the 'teeth44 on the main shaft. The eut-away portion 46 of the cam 45 here comesinto play, permitting the drive shaft to be rotated, and, when the lastof the teeth 43 has passed the main shaft, the raised por-` tion 48 ofthe cam 45 again locks the main shaft. Vhen the numeral key hasdepressed the segment through its normal stroke, the gear wheel 32 withthe teeth 31 will have made one complete revolution and furtherdepression of the key has no effect on the mechanism. The universal lockis swung back by its spring 42 to lock the main shaft, and the raisedsurface 34 of the segment will lock the gear wheel 32 against furtherrotation.

kIf now the numeral key is released, the key lever will rise, raisingits segment again. In view of the fact that the tooth 33 is entirelyoutside the point circle of the teeth 30, it will fail to na h with thebroad notch 35, and the gear wheel 32 will then be locked againstmeshing at allby the broad raised surface 37, until at the'very end ofthe segments up-stroke, the raised portion 41 strikes the tooth 33 andgives the gear wheel 32 a slight turn which makes it positively meshwith the first tooth the next time the segment is operated.

In order to prevent any incomplete ope-ration of the Computingmechanism, a full stroke mechanism is provided for the segment,consisting of teeth 59 cut on it approximately at an angle of forty-fivede-A grees, over which a rock arm 60 is arranged to slide, as best shownin Fig. 4, where it will be seen that, if the segment is depressed, theteeth 59 will slide easily past the arm 60, which is pressed againstthem by means of a spring 61.

1f, however, the key should be released and the segment starts to returnat an intermediatek point, some tooth 59 will lock against the arm 60.After the segment has completed its full downward stroke, the end of itwill permit the arm 60 t0 have full play again, and the spring 61 willswing it hor1- zontal so that the teeth striking the rock arm will turnit in the reverse direction and slide over it easily.. The teeth at thebottom of the segment are cut away at 62 to permit the rock arm to berestored to its operative position by spring 61, as seen in Fig. 3.

The totalizer herein shown is of the outside drive master wheel type andmay comprise any preferred form of earry-over mechanism for the dialwheels.

1t will be noted that the main shaft 27 is always driven in onedirection, so that only one Side of the teeth 44 is shown of odontoidform. The non-driving side is preferably out away, as seen at 63, sothat the first tooth 43 will always mesh with the propertooth 44.

The present invention provides a light and simple construction for thepositive key drive. There are no extral parts added to move any part toan operative position, neither are strong Springs Vused for any suchpurpose. Practically no parts are reversed in movement except those thatreciprocate bodily with the key lever. so that little force is needed inpressing the keys.

Variations may be resorted to within the scope of the invention, andportions of the im rovements ma be used without others.

aving thus escribed my invention, I claim:

l. In a computing machine, the combination of a partly toothed driver,means for reciprocating said driver, a driving gear driven by the teethof'said driver, a surface on said driver locking said gear but allowinglost motion, and an extension of said surface positively locking saidgear and holding said gear so that on the next reci rocation it willmesh with the teeth of said driver, said locking surface and itsextension lying in the same plane with the driver teeth.

2. In a computing machine, the combination of a partly toothed driver,means for reciprocating said driver, a drivin gear driven by the teethof said driver t-rough a complete revolution at each driviiig operationof said driver, a Surface on sai driver holding said gear locked on thereverse stroke of said driver but allowing lost motion, and an extensionof fsaid surface positively locking said gear and positively controllingsaid gear so that on the next reciprocation it will mesh with the teethof Said driver, said locking surface and its extension lying in the sameplane with the driver teeth. l

3. lIn a computing machine, a driving segment having a curved, flatsurface and a surface inclined relatively thereto, and a gear wheeldriven by said segment and with which the inclined surface forms aGeneva lock.

4. In a computing machine, the combination with a. reciprocatabletoothed driver, of a mutilated toothed gear to be engaged and driventhereby during an intermediate poi'- tion .of each forward strokethereof, said gear having its teeth so spaced that, when standing in theposition to which it is moved on a forward stroke of said driver, theteeth of said driver may be moved past said gear ona return strokewithout engagement therewith, a surface on said driver to coperate withsaid gear after the driver teethhave passed said gear on a return stroketo permit said gear to be moved from its disengaging position withrespect to said driver teeth, but no farther, and' means on Said driverto engage a tooth of said gear adjacent the point of mutilation, on thereturn stroke of said driver to positively move said gear to and retainitin engaging position in readiness for another forward stroke of isaiddriver. i,

5. The combination of a series of computing wheels, a ear connected todrivesaid computing whee s, a reciprocating driver,

and means for 'operating said driver, said driver having means thereonto effect a partial rotation of said gear by enga ment with the teeththereof during one str o e and having meansthereon for completing therotation of said gear, by enga ementwith the teeth thereof on returnstro e of said driver,- so as to completely rotate said gear ybyengagement of the driver With the teeth of said gear during a singlereciproc'ation of the driver.

6. The combination with a toothed driving gear, of a reciprocatingmember having a surface normally holding said gear locked by engagementwith teeth on said gear, teeth on said reciprocating member adapted toengage teeth on said gear and rotate said ar, and a Geneva lockingportion interme iate the surface normally engaged by the gear teeth andthe teeth on said reciprocating member, permitting said gear to stand sothat its teeth lie inside the point line of the teeth of saidreciprocating member.

7. The combination with a segment and a. driving unit operated thereby,of teeth lying in one plane along said segment, cooperating teet i onsaid driving unit adapted to be driven by said segment teeth, and aGeneva locking surface normall said unit so that it will be turned y thesegment teeth whenever the segment is o erated, said surface lying inthe same p ane with said segment teeth.

8. The combination with a driving unit having teeth thereon, of asegment havin teeth normally disengaged from those o said unit, saidunit also having a Geneva. locking surface adapted to allow lost motionof said unit, and an extension of said Geneva locking surfacecooperating with the teeth on said unit for holding said unit so thatitsteeth will mesh with the segment teeth as the segment travels from a.position in which said unit is locked by said locking surface toposition to rotate said unit.

9. Ina computingmachine, the combination withareciprocatable tootheddriver, of a toothed gear to be engaged and driven thereby during anintermediate portion of each forward stroke thereof, said gear havingits teeth so spaced that, when standing in the position to which it ismoved on a forward stroke of said driver, the teeth of said driver maybe moved past said gear on a return stroke without engagement therewith,means on said driver to positively move-said gear to, and hold it in,such disengaging position during the completion of a driving stroke, andmeans on said driver to engage a tooth of said gear at the completion ofa return strokepf said driver, and positively move said gear to andretain it in engaging position in readiness for another forward stroke-1of said driver. 3;,

10. In a computing machine, the combinaholding iso tion with areciprocatable toothed driver, of a toothed gear to be engaged anddriven thereby on each forward stroke thereof, said gear having itsteeth so spaced that, when standing in the position to which it is movedon a forward stroke of said driver, the teeth of said driver' may bemoved past said gear on a return stroke without engagement therewith,means on said driver to hold said gear in such disengaging positionduring return stroke until the driver teeth have passed said gear, meanson said driver to coope ate with said gear after the driver teeth havepassed said gear on a return stroke to permit said gear t0 be moved fromits disengaging position with respect to said driver teeth to itsengaging position, but no farther, and means on said driver to engage atooth of said gear at the completion of a return stroke of said driverand positively move said gear to and retain it in position t0 be engagedby the teeth of said driver on its next forward stroke.

11. In a computing machine, the combination with a reciprocatabletoothed driver, of a toothed gear to be engaged and driven therebyduring an intermediate portion of each forward stroke thereof, said gearhaving its teeth so spaced that, when standing in the position to whichit is moved on a forward stroke of said driver, the teeth of said drivermay be moved past said gear on a return stroke without engagementtherewith, means on said driver to positively move said gear to, andhold it in, such disengaging position during the completion of adriving` stroke,

means on said driver to hold said gear in such disengaging positionduring return stroke until the driver teeth have passed said gear, meanson said driver to cooperate with said gear after the driver teeth havepassed said gear on a return stroke to permit said gear to be moved fromits disengaging position with respect to said driver teeth to itsengaging position, but no farther, and means on said driver, lying inthe sameplane with said driver teeth, to engage said gear at thecompletion of a return stroke of said driver, and positively move saidgear t0 and retain it in. engaging position in readiness for anotherforward stroke of said driver.

12. In a computing machine, the combination with a mutilated gear devoidof teeth at one portion of its eircun'iference, of an oscillating drivereffect a part of a revolution of said gear by engagement with the teeththereof during one stroke and having means thereon, lying in the sameplane with said driver teeth, for completing one full revolution of saidgear on the opposite stroke, so as to effect a complete revolution ofsaid gear on each complete oscillation of said driver'.

13. In a computing machine, the combimove said 0ear to l b having meansthereon r9' nation with a reciprocatable toothed driver, of a toothedgear to be engaged and driven thereby on each forward stroke thereof,said gear having its teeth so spaced that, when .tanding in the positionto which it is moved on a forward stroke of said driver, the teeth ofsaid driver may be moved past said gear on a return stroke withoutengagement therewith, means on said driver to hold said gear in suchdisengaging position during return stroke until the driver teeth havepassed said gear, and means on said driver to engage a tooth of saidgear at the completion of a return stroke of said driver, and positivelymove said gear to and retain it in position to be engaged by the teethof said driver on its next forward stroke.

14. In a computing machine, the combination with a reciprocatabletoothed driver, of a toothed gear to be engaged and driven therebyduring an intermediate portion of each forward stroke thereof, said gearhaving its teeth so spaced that, when standing in the position to whichit is moved on a forward stroke of said driver, the teeth of said drivermay be moved past said gear on a return stroke without engagementtherewith, means on said driver to positively move said gear to, andhold itl in, such disengaging position during the completion of adriving stroke, means on said driver to coperate with said gear afterthe driver teeth have passed said gear on a return stroke to permit saidgear to be moved from its disengaging position with respect to saiddriver teeth to its engaging position, but no farther, and means on saiddriver, lying in the same plane with said driver teeth, to engage saidgear at the completion of a return stroke of said driver, and positivelymove said gear to and retain it in engaging position in readiness foranother forward stroke of said driver.

15. In a computing machine, the combination with a reciprocatabletoothed driver, of a toothed gear to be. engaged and driven therebyduring an intermediate portion of each forward stroke thereof, said gearhaving its teeth so spaced that, when standing in the position to whichit is moved on a forward stroke. of said driver, the teeth of saiddriver may be moved past said gear on a return stroke without engagementtherewith, means on said driver to positively and hold it in, suchdisengaging position during the completion of a driving stroke, andmeans on said driver, lying in the same plane with said driver teeth, toengage said gear at the completion of a return stroke of said driver,and positively move said gear to and retain it in engaging position inreadiness for another forward stroke of said driver.

16. The combination of a toothed gear; a driver having means thereonengageable withthe teeth on said gear, tiall rotation of the latter; akey for actuating said driver; and a cam on said driver engageable withone of the teeth on said gear to effect a further rotation of said gear.

17. In a computing machine, the combination with a reciprocatabletoothed driver, of a toothed gear to be engaged and driven thereby oneach forward stroke thereof, said gear having its teeth so spaced that,whenl standing in the position to which it is moved on a forward strokeof said driver, the teeth of said driver may be moved past said gear ona return stroke without engagement therewith, means on said driver tohold said gear in such disengaging position during return stroke untilthe driver teeth have passed said gear, means on said driver to coperatewith said gear after the driver teeth have passed said gear on a returnstroke to permit said gear to be moved from its disengaging positionwith respect to said driver teeth to its engaging position, but nofarther, and means on said driver, lying in the same plane with saiddriver teeth, to engageA said gear at the completion of a return strokeof said driyer, and positively move said gear to and retain it inposition to be engaged by the teeth of said driver on its next forwardstroke.

18. In a computing machine, the combination with a reciprocatabletoothed driver, of a toothed gear to be engaged and driven thereby oneach forward stroke thereof, said gear having its teeth so spaced that,when to effect a parstanding in the position to which it is movedv on aforward stroke of said driver, the teeth of said driver may be movedpast said gear on a return stroke without engagement therewith, means onsaid driver to hold said' gear' in such disengaging position duringreturn stroke until the driver teeth have passed said gear, and means onsaid driver, lying in the saine plane with said driver teeth, to engagesaid gear at the completion of a return stroke of said driver, andpositively movesnid gear to and\retain it inl position to be engaged'by' the teeth of said driver on its next forward stroke.

19. The combination, with a series of computing wheels; of a series ofnumeral keys for controlling the action of said computing wheels; amutilated gear devoid of teeth at a point in its circumference andconnected to drive one of said computing wheels; and a driver connectedto be actuated by one of said numeral keys and havingperipheially-locatedmeans to effect a complete rotation of saidmutilated gear by direct and positive engagement with the teeth thereof.

20. In a computing machine, the combination with a reciprocatabletoothed driver, of a toothed gear to be engaged and driven thereby oneach forward stroke thereof, said gear having its teeth so spaced that,when standing in' the position to whichlit is moved on a forward strokeof said driver, the teeth of said driver may be moved past said gear ona return stroke without engagement therewith, and a raised part on vsaiduntoothed portion of said driver to'engage a tooth of said gear at thecompletion of a return stroke of said driver, and-positively move saidgear to and retain it in engaging position in readiness for anotherforward stroke of said driver.

21. In a computing machine, the combination with a reciprocatabletoothed driver.1 of a toothed gear to be engaged and driven thereby oneach forward stroke thereof, said gear having its teeth so spaced that,when standing in the position to which it is moved on a forward strokeof said driver, the teeth of said driver may be moved past said gear ona return stroke without engagement therewith, and. a raised part on saiduntoothed portion of said driver, and lying in the same plane with saiddriver teeth, to engage said gear at the completion of a return strokeof said driver, and positively move said gear to and retain it inengaging position in readiness for another forward stroke of saiddriver.

22. In a computing machine, the combination with a reoiprocatabletoothed driver, of a toothed gear to be engaged and driven therebyduring an intermediate portion of each forward stroke thereof, said gearhaving its teethso spaced that, when standing 1n the position to whichit is moved on a. forward stroke of said driver, the teeth of saiddriver may be moved past said gear on a .return stroke withoutengagement therewith, means on said driver to positively move .said gearto, and hold it in, such disengaging position during the completion of adriving stroke, means on said driver to hold said gear in suchdisengaging position during return stroke until the driver teeth havepassed said gear, and means on said driver to engage a tooth of saidgear at the completion of a return stroke of said driver, and positivelymove said gear to and retain it in engaging osition in readiness foranother forwar stroke of said driver.

23. In a computing machine, the combination with a reciprocatabletoothed driver, of a toothed gear to be engaged and driven therebyduring an intermediate portion o f each forward stroke thereof, saidgear having its teeth so spaced that, when standing in the position towhich it is moved on a forward stroke of said driver, the teeth of saiddriver may be moved past said gear on a return stroke without engagementtherewith, means on said driver to positively move said gear to, andhold it in, such disengaging position during the completion of a drivingstroke, Imeans on said driverto hold said gear in such disengagingposition during return stroke until the driver teeth have passed saidgear, and 5 means on said driver, lying in the same plane with saiddriver teeth, to engage said gear at the completion of a'return strokeof said driver, and positively move said gear to and retain it inengaging position in readlness for another forward stroke of said 10drlver.

WALTER WRIGHT.

Witnesses z LoRENz L. PRITZL, B. GoL-DBERG.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, '.D. C.

